Performance analysis of a combined cooling and power (CCP) system based on waste heat recovery of internal combustion engine

In this paper, a combined cooling and power system (CCP) is carried out based on the waste heat recovery of internal combustion engine. Mathematical model is established and the effect of key parameters on thermodynamic performance is conducted. Results show that the decrease of expansion ratio and compressor inlet temperature in Brayton Cycle, the increase of turbine inlet temperature in Organic Rankine Cycle have positive effect on thermodynamic performance. The electrical power output and exergy efficiency increase with the rise of the turbine inlet pressure in Organic Rankine Cycle. The cooling capacity and cooling exergy both increase with the increase of ejector inlet pressure. In order to obtain the optimal design parameters and thermodynamic performance of the system, single-objective optimization is conducted by genetic algorithm. The conclusions reveal that a maximum exergy efficiency of 54.22% can be achieved, and the electrical power output and the cooling capacity are 31.58 kW and 3.15 kW, respectively. Then the waste heat of internal combustion engine could be efficiently recovered.